WO2019033486A1

WO2019033486A1 - Environmentally-friendly pickling corrosion inhibitor and application thereof

Info

Publication number: WO2019033486A1
Application number: PCT/CN2017/101734
Authority: WO
Inventors: 王立平; 崔明君; 任思明; 覃松绿; 赵海超
Original assignee: 中国科学院宁波材料技术与工程研究所
Priority date: 2017-08-17
Filing date: 2017-09-14
Publication date: 2019-02-21
Also published as: CN107385456A

Abstract

An environmentally-friendly pickling corrosion inhibitor and an application thereof. The corrosion inhibitor comprises polyaromatic nitrogen-containing carbon quantum dots. The preparation method for the corrosion inhibitor comprises: uniformly mixing a compound containing a benzene ring and an amino group as a reaction monomer with a solvent, and then heating to conduct a solvothermal reaction, to give a pickling inhibitor containing polyaromatic nitrogen-containing carbon quantum dots. The pickling corrosion inhibitor features simple synthesis, is non-toxic and harmless, and dissolves in acids easily. Furthermore, the pickling corrosion inhibitor is simple to use, and can be added to a hydrochloric acid solution for use as a cleaning liquid to pickle carbon steel. The pickling corrosion inhibitor can effectively inhibit corrosion of carbon steel in acid solutions and has a high sustained release rate. Further, the pickling corrosion inhibitor can be used in small amounts and is environmentally friendly and highly efficient.

Description

Environmentally friendly pickling inhibitor and its application

Technical field

The invention relates to a corrosion inhibitor, in particular to an environmentally friendly polyaromatic nitrogen-containing carbon quantum dot pickling corrosion inhibitor for carbon steel pickling, a preparation method and application thereof, and belongs to the technical field of metal anticorrosion.

Background technique

Pickling is an inexpensive, simple and effective method to remove dirt and rust on the surface of metal materials. In the pickling process, the most commonly used acids are mainly hydrochloric acid and sulfuric acid, and hydrochloric acid is the most widely used pickling agent; however, in the cleaning process, hydrochloric acid is highly corrosive to metallic materials, causing over-etching; In addition, hydrogen generated by the reaction of hydrochloric acid with metal causes hydrogen embrittlement corrosion of the metal material, and the generation of hydrogen gas brings out a large amount of acid mist, which deteriorates working conditions. Therefore, it is necessary to add a corrosion inhibitor during the pickling process to reduce corrosion of the metal material and volatilization of the acid mist.

Currently commonly used corrosion inhibitors mainly include inorganic corrosion inhibitors and organic corrosion inhibitors. Traditional inorganic corrosion inhibitors mainly include nitrites and chromates, but such corrosion inhibitors can cause great harm to humans, animals and the ecological environment; while organic corrosion inhibitors such as phosphorus and sulfur have good properties. The slow release effect, but it also has great harm to the environment. Therefore, with the improvement of human environmental awareness and the idea of sustainable development, the development of non-toxic and efficient environmentally friendly corrosion inhibitors has become a new direction for the study of corrosion inhibitors.

Summary of the invention

The main object of the present application is to provide an environmentally friendly pickling corrosion inhibitor and its use to overcome the deficiencies of the prior art.

To achieve the foregoing object, the technical solution adopted by the present application includes:

The embodiments of the present application provide the use of polyaromatic nitrogen-containing carbon quantum dots for preparing a pickling inhibitor.

Preferably, the polyaromatic ring nitrogen-containing carbon quantum dots have a particle diameter of 3 to 4 nm.

Preferably, the constituent elements of the polyaromatic nitrogen-containing carbon quantum dots include C, N and O.

In some preferred embodiments, the preparation method of the polyaromatic ring nitrogen-containing carbon quantum dots comprises:

The reaction monomer and the solvent are uniformly mixed, and then heated to carry out a solvothermal reaction to cause dehydration, decarboxylation, and bonding between the molecules to obtain a polyaromatic nitrogen-containing carbon quantum dot.

Wherein the reactive monomer comprises a compound containing a benzene ring and an amino group.

Further, the reactive monomer includes an aminobenzoic acid compound and/or a phenylenediamine compound.

Further, the reactive monomer includes any one or a combination of two or more of 4-aminosalicylic acid, 5-aminosalicylic acid, o-phenylenediamine, p-phenylenediamine, and m-phenylenediamine.

In some embodiments, the solvothermal reaction has a temperature of from 180 to 200 ° C for a period of from 12 to 18 hours.

Further, the volume-to-mass ratio of the solvent to the reaction monomer is 5 mL: 0.1 g to 20 mL: 0.1 g, preferably 5 mL: 0.1 g to 10 mL: 0.1 g.

The embodiment of the present application also provides an environmentally friendly pickling inhibitor, the corrosion inhibitor comprising a polyaromatic nitrogen-containing carbon quantum dot.

The embodiments of the present application also provide the aforementioned environmentally friendly pickling inhibitor in the field of metal corrosion protection.

Further, the application comprises: adding the environmentally friendly pickling inhibitor to the pickling agent before pickling the metal material, wherein the environmentally friendly pickling inhibitor is added at a concentration of 0 to 200 mg·L ^-1 .

The embodiment of the present application further provides a pickling method for a metal material, which comprises: washing the metal material with an acid pickling agent containing the environmentally friendly pickling inhibitor described above.

Compared with the prior art, the environmentally friendly pickling inhibitor provided by the present application includes polyaromatic nitrogen-containing carbon quantum dots. The polyaromatic ring nitrogen-containing carbon quantum dots are mainly prepared by a solvothermal method using aminobenzoic acid, phenylenediamine or the like as a main raw material, and have the characteristics of simple synthesis, no toxicity, no toxicity, and easy to be dissolved in acid; The pickling corrosion inhibitor containing the polycyclic ring nitrogen-containing carbon quantum dots is simple to use, and the hydrochloric acid solution can be used as the cleaning liquid to pickle the carbon steel, which can effectively inhibit the corrosion of the carbon steel in the acid solution. Carbon steel has a high sustained release rate, low dosage, environmental protection and high efficiency.

DRAWINGS

1a and 1b are respectively the content of polyaromatic nitrogen-containing carbon in the environmentally friendly pickling inhibitor obtained in Example 1 of the present application. TEM and SPM topography of sub-points;

1c, 1d, and 1e respectively correspond to a two-dimensional profile of the polyaromatic nitrogen-containing carbon quantum dots passing through the three curves in FIG. 1b;

1f is an XPS spectrum diagram of 4-aminosalicylic acid and the prepared polyaromatic nitrogen-containing carbon quantum dots in Example 1 of the present application;

2 is a polarization diagram of a ¹ mol·L ^-1 HCl solution containing different concentrations of environmentally friendly pickling inhibitors after being immersed in carbon steel for 0.5 h in Example 1 of the present application;

3 is a graph showing the inhibition efficiency with the immersion time under the optimum corrosion inhibitor concentration (10 mg L ^-1 ) in Example 1 of the present application;

4a is a scanning electron micrograph of the Q235 carbon steel in the hydrochloric acid solution having a corrosion inhibitor concentration of ¹ mol·L ^-1 for 72 hours in Example 1 of the present application;

4b is a scanning electron micrograph of the Q235 carbon steel in the first embodiment of the present application after being immersed in a hydrochloric acid solution having a corrosion inhibitor concentration of 10 mg L ^-1 for 72 hours;

5 is a polarization diagram of a ¹ mol·L ^-1 HCl solution containing different concentrations of environmentally friendly pickling inhibitors after being immersed in carbon steel for 0.5 h in Example 2 of the present application;

6 is a graph showing the inhibition efficiency with the immersion time under the optimum corrosion inhibitor concentration (200 mg L ^-1 ) in Example 2 of the present application;

7 is a scanning electron micrograph of the Q235 carbon steel in the hydrochloric acid solution having a corrosion inhibitor concentration of 200 mg L ^-1 for 72 hours in Example 2 of the present application;

8 is a polarization diagram of a carbon steel immersed in a carbon steel for 72 hours in Example 3 of the present application with a ¹ mol·L ^-1 HCl solution containing different concentrations of environmentally friendly pickling inhibitors;

9 is a graph showing the inhibition efficiency with the immersion time under the optimum corrosion inhibitor concentration (200 mg L ^-1 ) in Example 3 of the present application;

Figure 10 is a scanning electron micrograph of the Q235 carbon steel in Example 3 of the present application after being immersed in a hydrochloric acid solution having a corrosion inhibitor concentration of 200 mg L ^-1 for 72 hours.

Detailed ways

In recent years, carbon quantum dots have caused extensive research in the field of nanomaterials. Their fluorescence, water solubility and low toxicity make these carbon quantum dots have high application value in the field of biosensing. Industry R&D personnel have reported the successful preparation of fluorescent, low-toxic nitrogen-containing carbon quantum dots by heat treatment of 4-aminosalicylic acid solvent. It is also reported that phenylenediamine solvent also exhibits good fluorescence after heat treatment. Cell compatibility. By comparison, we can find that both carbon quantum dots have benzene ring and nitrogen atom; and the sustained release agent with this structure usually has a certain physical and chemical action with the metal surface to reduce the corrosion of the metal.

In view of the deficiencies in the prior art, the inventors of the present invention have been able to propose the technical solution of the present application through long-term research and extensive practice, mainly by using a benzoic acid and phenylenediamine as main raw materials to obtain a polyaromatic ring by a solvothermal method. Environmentally friendly pickling inhibitor for nitrogen-containing carbon quantum dots. The technical solution, its implementation process and principle, etc. will be further explained as follows.

One aspect of an embodiment of the present application provides a polyaromatic ring nitrogen-containing carbon quantum dot for use in preparing a pickling inhibitor.

Wherein, the polyaromatic ring nitrogen-containing carbon quantum dots have a particle diameter of 3 to 4 nm.

The reaction monomer and the solvent are uniformly mixed, and then heated to carry out a solvothermal reaction, and dehydration, decarboxylation and bonding between the molecules occur, and finally a polyaromatic nitrogen-containing carbon quantum dot is obtained.

In some preferred embodiments, the reactive monomer comprises an aminobenzoic acid compound and/or a phenylenediamine compound.

Further, the reactive monomer is selected from any one or a combination of two or more of 4-aminosalicylic acid, 5-aminosalicylic acid, o-phenylenediamine, p-phenylenediamine, and m-phenylenediamine. , but not limited to this.

Further, the volume-to-mass ratio of the solvent to the reactive monomer (which may also be referred to as a liquid-solid ratio) ranges from 5 mL: 0.1 g to 20 mL: 0.1 g, preferably a volume-to-mass ratio of 5 mL: 0.1 g to 10 mL: 0.1 g.

Further, the solvent is selected from the group consisting of ethanol.

Further, the method for preparing the polyaromatic ring nitrogen-containing carbon quantum dot further comprises: after the reaction is completed, the reaction system is purified by placing in a dialysis bag having a molecular weight cut off of 1.0 kDa to 5.0 kDa, and then removing the solvent and drying to obtain a solution. More Aromatic ring nitrogen-containing carbon quantum dots.

Preferably, the dialysis bag has a molecular weight cut off of 1.0 kDa to 3.0 kDa.

Wherein, in some specific embodiments, the preparation method of the polyaromatic ring nitrogen-containing carbon quantum dots may include:

a. The raw material is dissolved in an appropriate amount of absolute ethanol and heated at 200 ° C for 18 hours, and the raw materials include 4-aminosalicylic acid, 5-aminosalicylic acid, o-phenylenediamine, p-phenylenediamine, and m-benzene. Diamines, and other benzene ring/amino containing monomers.

b. After completion of the reaction, the reaction solution was placed in a 3.0 kDa dialysis bag for purification to remove unreacted raw materials.

c. The purified product is centrifuged to remove the solvent, and dried under vacuum to obtain the polyaromatic ring nitrogen-containing carbon quantum dots.

Another aspect of an embodiment of the present application provides an environmentally friendly pickling inhibitor comprising a polyaromatic nitrogen-containing carbon quantum dot.

The reaction monomer is uniformly mixed with the solvent, and then heated to carry out a solvothermal reaction to obtain a polyaromatic ring nitrogen-containing carbon quantum dot.

Further, the solvent is selected from the group consisting of ethanol.

Further, the method for preparing the polyaromatic ring nitrogen-containing carbon quantum dot further comprises: after the reaction is finished, purifying the reaction system in a dialysis bag having a molecular weight cut off of 1.0 to 5.0 kDa, and then removing the solvent and drying to obtain the Polyaromatic ring nitrogen-containing carbon quantum dots, wherein the preferred dialysis bag has a molecular weight cutoff of 1.0 to 3.0 kDa.

Another aspect of an embodiment of the present application also provides the use of the aforementioned environmentally friendly pickling inhibitor, particularly Application in the field of metal corrosion protection.

Preferably, the pickling agent comprises hydrochloric acid.

Another aspect of the embodiments of the present application further provides a pickling method for a metal material, comprising: washing the metal material with an acid pickling agent containing the environmentally friendly pickling inhibitor described above.

Preferably, the metal material includes carbon steel or the like, but is not limited thereto.

The principle that the environmentally friendly pickling inhibitor obtained in the present application can carry out metal corrosion protection is that the polyaromatic nitrogen-containing carbon quantum dots prepared by the solvothermal method interact with the surface of the carbon steel to form an adsorption layer on the surface of the carbon steel. , which can slow down the corrosion of metals.

The technical solutions of the present application are further described in detail below with reference to the embodiments and the accompanying drawings, but the present application is not limited to the following embodiments.

The evaluation criteria and methods for corrosion inhibition performance adopted in the following examples of the present application are as follows:

1. GB10124-88 "Metal material laboratory uniform corrosion full immersion test method" for weight loss test;

2. Scanning electron microscopy is used to observe the corrosion morphology.

Example 1

1. 0.6 g of 4-aminosalicylic acid was dissolved in 60 mL of absolute ethanol and then heated at 200 ° C for 18 h. After completion of the reaction, the reaction solution was placed in a 3.0 kDa dialysis bag for purification to remove unreacted raw materials. The purified product is centrifuged to remove the solvent, and dried under vacuum to obtain a polyaromatic nitrogen-containing carbon quantum dot. The TEM and SPM topography can be respectively referred to FIG. 1a and FIG. 1b, and the polyaromatic nitrogen-containing carbon quantum dots can be observed. The size is about 3 ~ 4nm (as shown in Figure 1c, Figure 1d, Figure 1e), and mainly composed of three elements C, N, O (Figure 1f). The obtained polyaromatic ring nitrogen-containing carbon quantum dots are prepared to form an environmentally friendly pickling inhibitor.

2. The Q235 carbon steel steel sheet was immersed in a ¹ mol·L ^-1 hydrochloric acid solution, and the environmentally friendly pickling corrosion inhibitor prepared in the present example was added to make the corrosion inhibitor concentration 0 mg·L ^-1 , 1 mg·L respectively. ^-1 , 5 mg·L ^-1 , 10 mg·L ^-1 , 50 mg·L ^-1 , 100 mg·L ^-1 , and immersed at room temperature for 0.5 hour for polarization test.

The polarization test results are shown in Figure 2. The corrosion inhibition efficiencies at different inhibitor concentrations were 0, 12.3%, 86.7%, 90.9%, 89.3%, and 87.2%, respectively. It is 10 mg·L ^-1 .

3. The Q235 carbon steel steel sheet is immersed in a ¹ mol·L ^-1 hydrochloric acid solution, and the concentration of the environmentally friendly pickling inhibitor prepared in the present embodiment is the concentration having the maximum corrosion inhibition rate, that is, 10 mg·L ^-1 . When immersed for 72 hours at room temperature, the corrosion inhibition efficiency as a function of immersion time is shown in Fig. 3.

(1) Weight loss test results: The corrosion inhibitor concentration was 10 mg·L ^-1 , and after 72 hours of soaking, the inhibition efficiency was 94%.

(2) Observation by scanning electron microscopy: After 72 hours, the Q235 carbon steel sheet immersed in ¹ mol·L ^-1 hydrochloric acid solution has undergone severe corrosion, as shown in Figure 4a; and the concentration of inhibitor added is 10 mg. • The surface of Q235 carbon steel immersed in L ^-1 hydrochloric acid solution is relatively light, but the scratches caused by polishing have disappeared due to corrosion, as shown in Figure 4b.

Example 2

1. 0.6 g of p-phenylenediamine was dissolved in 60 mL of absolute ethanol and then heated at 180 ° C for 12 h. After completion of the reaction, the reaction solution was placed in a 3.0 kDa dialysis bag for purification to remove unreacted raw materials. The purified product was centrifuged to remove the solvent, and dried under vacuum to obtain a polyaromatic ring nitrogen-containing carbon quantum dot. The obtained polyaromatic ring nitrogen-containing carbon quantum dots are prepared to form an environmentally friendly pickling inhibitor.

2. The Q235 carbon steel steel sheet was immersed in a ¹ mol·L ^-1 hydrochloric acid solution, and the environmentally friendly pickling corrosion inhibitor prepared in the present example was added to make the corrosion inhibitor concentration 0 mg·L ^-1 , 10 mg·L, respectively. ^-1 , 50 mg·L ^-1 , 100 mg·L ^-1 , 200 mg·L ^-1 , and immersed for 0.5 hour at room temperature for polarization test.

The polarization test results are shown in Figure 5. The sustained release efficiencies at different inhibitor concentrations were 0, 71%, 86%, 88%, and 88%, respectively.

3. The Q235 carbon steel steel sheet is immersed in a ¹ mol·L ^-1 hydrochloric acid solution, and the concentration of the environmentally friendly pickling inhibitor prepared in the present embodiment is the concentration having the maximum corrosion inhibition rate, that is, 200 mg·L ^-1 . When immersed for 72 hours at room temperature, the corrosion inhibition efficiency as a function of immersion time is shown in Fig. 6.

(1) Weight loss test results: The corrosion inhibitor concentration was 200 mg·L ^-1 , and the inhibition efficiency was 97.1% after 88 hours of soaking.

(2) Observation by scanning electron microscopy: After 72 hours, the Q235 carbon steel sheet immersed in ¹ mol·L ^-1 hydrochloric acid solution has severely corroded; and the concentration of corrosion inhibitor added is 200 mg·L ^-1 of hydrochloric acid. The surface of the Q235 carbon steel soaked in the solution is relatively light, and the surface polishing scratches still exist, as shown in Figure 7.

Example 3

1. 0.6 g of m-phenylenediamine was dissolved in 60 mL of absolute ethanol and then heated at 180 ° C for 12 h. After the reaction After completion, the reaction solution was placed in a 3.0 kDa dialysis bag for purification to remove unreacted raw materials. The purified product was centrifuged to remove the solvent, and dried under vacuum to obtain a polyaromatic ring nitrogen-containing carbon quantum dot. The obtained polyaromatic ring nitrogen-containing carbon quantum dots are prepared to form an environmentally friendly pickling inhibitor.

2. The Q235 carbon steel steel sheet was immersed in a ¹ mol·L ^-1 hydrochloric acid solution, and the environmentally friendly pickling corrosion inhibitor prepared in the present example was added to make the corrosion inhibitor concentration 0 mg·L ^-1 , 10 mg·L, respectively. ^-1 , 50 mg·L ^-1 , 100 mg·L ^-1 , 200 mg·L ^-1 , and immersed for 72 hours at room temperature for polarization test.

The polarization test results are shown in Figure 8. The sustained release efficiencies at different inhibitor concentrations were 0, 0, 73%, 89%, and 94%, respectively.

3. The Q235 carbon steel steel sheet is immersed in a ¹ mol·L ^-1 hydrochloric acid solution, and the concentration of the environmentally friendly pickling inhibitor prepared in the present embodiment is the concentration having the maximum corrosion inhibition rate, that is, 200 mg·L ^-1 . When immersed for 72 hours at room temperature, the corrosion inhibition efficiency as a function of immersion time is shown in Fig. 9.

(1) Weight loss test results: The corrosion inhibitor concentration was 200 mg·L ^-1 , and the corrosion inhibition efficiency was 99.0% after 88 hours of soaking.

(2) Observation by scanning electron microscopy: After 72 hours, a scanning electron micrograph of a Q235 carbon steel sheet immersed in a hydrochloric acid solution containing a 200 mg·L ^-1 corrosion inhibitor is shown in FIG.

In addition, the inventors of the present invention conducted experiments with reference to the other materials and conditions listed in the present specification in the manners of Example 1 - Example 3, and also obtained a high sustained release rate, low dosage, and environmentally friendly carbon steel. Environmentally friendly pickling inhibitor.

In summary, according to the above technical solution, the environmentally friendly pickling inhibitor provided by the present application is mainly prepared by a solvothermal method using aminobenzoic acid, phenylenediamine or the like as a main raw material, and has simple synthesis and no toxicity. It is easy to dissolve in acid and so on. At the same time, the environmentally friendly pickling inhibitor is simple to use. It can be used as a cleaning solution to pickle carbon steel by adding hydrochloric acid solution, which can effectively inhibit carbon steel in acid solution. The corrosion in the carbon steel has a high sustained release rate, low dosage and environmental protection and high efficiency.

It should be understood that the above embodiments are merely illustrative of the technical concept and the features of the present application, and the purpose of the present invention is to enable those skilled in the art to understand the contents of the present application and to implement it, and the scope of the present application is not limited thereto. For example, parts that are not described in this specification can be implemented by reference to the prior art, and equivalent changes or modifications made in accordance with the spirit of the present application are intended to be included within the scope of the present application.

Claims

The use of polyaromatic ring nitrogen-containing carbon quantum dots for preparing pickling inhibitors.
The use according to claim 1, wherein the polyaromatic ring nitrogen-containing carbon quantum dots have a particle diameter of from 3 to 4 nm.
The use according to claim 1, characterized in that the constituent elements of the polyaromatic nitrogen-containing carbon quantum dots comprise C, N and O.
The invention according to claim 1, wherein the preparation method of the polyaromatic ring nitrogen-containing carbon quantum dots comprises: uniformly mixing the reaction monomers with a solvent, and then heating to carry out a solvothermal reaction, thereby finally obtaining a polyaromatic ring. a nitrogen-carbon quantum dot; wherein the reactive monomer comprises a compound containing a benzene ring and an amino group.
The use according to claim 4, characterized in that the reactive monomer comprises an aminobenzoic acid compound and/or a phenylenediamine compound.
The use according to claim 5, wherein the reactive monomer comprises any of 4-aminosalicylic acid, 5-aminosalicylic acid, o-phenylenediamine, p-phenylenediamine and m-phenylenediamine. One or a combination of two or more.
The use according to claim 4, wherein the volume-to-mass ratio of the solvent to the reactive monomer ranges from 5 mL: 0.1 g to 20 mL: 0.1 g.
The use according to claim 7, characterized in that the volume-to-mass ratio of the solvent to the reactive monomer ranges from 5 mL: 0.1 g to 10 mL: 0.1 g.
The use according to claim 4 wherein the solvent comprises ethanol.
The use according to claim 4, wherein the solvothermal reaction has a temperature of from 180 to 200 ° C for a period of from 12 to 18 hours.
The application according to claim 4, further comprising: after the solvothermal reaction is completed, purifying the obtained mixed reaction system in a dialysis bag having a molecular weight cutoff of 1.0 kDa to 5.0 kDa, followed by removing The solvent is dried to obtain the polyaromatic ring nitrogen-containing carbon quantum dots.
The use according to claim 11, wherein the dialysis bag has a molecular weight cut off of from 1.0 kDa to 3.0 kDa.
An environmentally friendly pickling inhibitor, characterized in that the corrosion inhibitor comprises a polyaromatic nitrogen-containing carbon quantum point.
The environmentally-friendly pickling inhibitor according to claim 13, wherein the polyaromatic ring nitrogen-containing carbon quantum dots have a particle diameter of from 3 to 4 nm.
The environmentally friendly pickling inhibitor according to claim 13, wherein the constituent elements of the polyaromatic nitrogen-containing carbon quantum dots comprise C, N and O.
The environment-friendly pickling inhibitor according to claim 13, wherein the preparation method of the polyaromatic nitrogen-containing carbon quantum dots comprises uniformly mixing the reactive monomer with a solvent, followed by heating to carry out a solvothermal reaction. Obtaining a polyaromatic ring nitrogen-containing carbon quantum dot; wherein the reactive monomer comprises a compound containing a benzene ring and an amino group.
The environmentally-friendly pickling inhibitor according to claim 16, wherein the reactive monomer comprises an aminobenzoic acid compound and/or a phenylenediamine compound.
The environmentally friendly pickling inhibitor according to claim 17, wherein said reactive monomer comprises 4-aminosalicylic acid, 5-aminosalicylic acid, o-phenylenediamine, p-phenylenediamine and Any one or a combination of two or more of m-phenylenediamine.
The environmentally-friendly pickling inhibitor according to claim 16, wherein the volume-to-mass ratio of the solvent to the reactive monomer is in the range of 5 mL: 0.1 g to 20 mL: 0.1 g.
The environmentally-friendly pickling inhibitor according to claim 19, wherein the volume-to-mass ratio of the solvent to the reactive monomer ranges from 5 mL: 0.1 g to 10 mL: 0.1 g.
The environmentally friendly pickling inhibitor according to claim 16, wherein the solvent comprises ethanol.
The environmentally-friendly pickling inhibitor according to claim 16, wherein the solvothermal reaction temperature is 180 to 200 ° C and the time is 12 to 18 h.
The environment-friendly pickling inhibitor according to claim 16, further comprising: after the solvothermal reaction is completed, placing the obtained mixed reaction system at a molecular weight cutoff of 1.0 kDa to 5.0 kDa. The dialysis bag is purified, and then the solvent is removed and dried to obtain the polyaromatic ring nitrogen-containing carbon quantum dots.
The environmentally-friendly pickling inhibitor according to claim 23, wherein the dialysis bag has a molecular weight cut off of 1.0 kDa to 3.0 kDa.
Use of the environmentally friendly pickling corrosion inhibitor according to any one of claims 13-24 in the field of metal corrosion protection.
The use according to claim 25, comprising: adding said environmentally friendly pickling inhibitor to the pickling agent prior to pickling the metal material, wherein said environmentally friendly pickling is slow The concentration of the etchant is 0 to 200 mg·L -1 .
The use according to claim 26, wherein the pickling agent comprises hydrochloric acid.
A method of pickling a metal material, comprising: washing a metal material with an acid pickling agent containing the environmentally-friendly pickling inhibitor according to any one of claims 13-24.
A method of pickling a metal material according to claim 28, wherein said metal material comprises carbon steel.